Mast band



Feb. 9, I W. E. HALE MAST BAND Filed May 13, 1929 3 Sheets-Sheet 1 5* @W 8.5 MM,

W. E. HALE MAST BAND Feb. 9, 1932.

Filed May 13, 19 29 s Sheets-Sheet 2 li'fOR/VEK 9, w E HALE MAST BAND Filed May 13, 1929 5 Sheetf-Sheet 3 Patented Feb. 9, 1932 "UNITED STATES ATEN rarer.

WILLIAM E. HALE, OF AMBLER, PENNSYLVANIA, ASSIGNOR TO B. H. BEAUMONT COIL OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA MAST BAND a cation filed May 13, 1929. Serial No. 362,542.

My invention relates to an improved mast band for supporting pulley sheaves or other devices at the top of a mast so as to be able to rotate freely about it.

=Onefeature of my invention consists in providing yokes attached to the straps which form the band. These yokes have arcuate portions adapted to take the wear when the strain is on the opposite yoke and have lugs depending downwardly therefrom in such a manner that when the sheave is attached thereto the pull on the sheave is transmitted so that the action of the stress is on the axis of the mast thus avoiding the bending moment of the lever arm of the strap.

The prior straps over which my invention is an improvement consisted of a pair of semicircular members each having at one end an extending portion to which the sheave was attached. The severe stress to which these straps were subjected had a tendency to straighten out the curved portion of the straps at the point from, which the portion to which the sheave was attached projected. As these straps were usually forgings they were weakened at these right-angled bends and frequently broke. In addition, these bands tended to distort and bind on the circular casting, by which they were attached to the mast, instead of rotating freely thereon. In addition, as the pull on the sheave was usually downward these straps tended to distort in a vertical plane, and due to this dis tortion, bind on the mast and prevented rotation.

For a more complete exposition of my invention reference may be had to the annexed drawings and specification at the end whereof my invention will be pointed out and specifically claimed. In the drawings,

Figure 1 represents a plan View of my mast band and the supporting structure therefor. Figure 2 is a side view partially in section of the structure shown in Figure 1.

Figure 3 is a perspective view'of a top holding plate.

Figure 4 is a perspective view of a segmental casting which forms a part of the support.

Figure 5 is a perspective view of one of the yokes.

Figure 6' is a perspective view of one of the lower support plates.

Figure 7 is a plan view partially in cross section showing a modified form of my dev1ce.

Figure 8 is a side elevation of the modification shown in Figure 7.

, Referring to the drawings,

1 represents the mast. In order to form a support upon which the strap may rotate there are provided a' plurality of segmental castingsQ having a flat side 3 adapted to fit against the mast and having in their opposite face an arcuate groove 4. These arcuate members are attached to the mast by means of a plurality of upper support plates 5 and lower support plates 6. i i r i The mast band, which is rotatably mounted on the mast, includes a pair of straps 7 which are adapted to fit in the grooves 4. At theirends the straps 7 are adapted to be attached to yokes 8 by means of bolts 9 or in any other suitable manner. The yokes 8 also have an arcuate rear portion 10 which is adapted to fit into the grooves 4. The yokes 8 also have, depending therefrom, lugs 11 which contain a perforation 12 by means of which pulley sheaves 13 or other devices may be attached to the mast band. The holes 12 are so located that the usual downward strain upon the sheave 13 is transmitted to the-mast 1 in such a manner that the stress-falls upon the of the mast. This prevents any tendency of the yoke 8 to form a lever having a bending moment in a vertical plane about the mast.

The normal position of the cable attached to the sheave 13 is such that the strain from the cable passes through the center of the zone in which the stresses of the yoke 8 are borne by the mast 1.

Owing to the fact that the straps 7 are bent over awide arc rather than a small one the strain upon these straps comes in a longitudinal direction and they are, therefore, not subject to distortion.

In addition the strain from one yoke is transmitted to the rear arcuate portion of the opposite yoke so that the wear comes at this point.

It is obvious that one of the yokes 8 may be omitted and a single strap 7 connected about the mast and attached at its ends to one of the yokes 8.

I do not intend to be limited in the practice of my invention save as the scope of the prior art and of the attached claims may require.

I claim:

1. A mast band comprising a plurality of straps and a plurality of yokes attached to the ends of said straps alternating therewith, said yokes having lugs depending from the centers thereof.

2. A mast band structure comprising an element providing a circular groove, and a mast band adapted to cooperate with said groove including a plurality of straps and a plurality of yokes attached to the ends of said straps alternating therewith, said yokes having lugs outstanding therefrom.

8. A mast band structure comprising an element providing a circular groove, a mast band adapted to cooperate with said groove including a plurality of straps and a plurality of yokes attached to the ends of said straps alternating therewith, said yokes having lugs outstanding therefrom, and a sheave attached to the lugs on one yoke.

4. A mast band structure including a mast, a plurality of segmental members having grooved faces, a plurality of straps adapted to fit in said grooves, and a plurality of yokes attached to the ends of said straps alternating therewith, said yokes having arcuate rear portions adapted to fit in said grooves and having perforated lugs depending therefrom.

5. In a circular mast band having a strap, attaching means comprising a yoke internally arcuate in form and externally provided with a face disposed generally tangential to the band and adapted to receive the end por- L tion of the strap, and lugs depending from the center of said yoke.

6. A mast band comprising a strap, a yoke attached to the ends of said strap, lugs de pending from the center of said yoke, and connecting means for a cable fastened to said lugs so that strain from said cable in normal position passes through the center of the zone in which the stress of said yoke is borne by said mast so that the yoke has no bending moment in a vertical plane about the mast.

7. A mast band structure including a mast, a plurality of segmental members having external grooved faces, a plurality of angle irons supporting the horizontal faces of said segmental members, a plurality of straps carried in said grooved faces, a plurality of yokes attached to the ends of said straps alternating therewith, lugs depending from the centers of said yokes, and a sheave attached to the lugs on one of said yokes.

8. A mast band comprising a strap, a yoke attached to the ends of said strap, and connecting means for a cable fastened to said yoke below the horizontal center thereof so that strain from said cable in normal position passes through the center of the zone in which the stress of said yoke is borne by the mast so that the reaction from the vertical stress is distributed equally over the entire area of the said zone.

9. A mast band comprising a connection encircling the major portion of said mast, a yoke attached to the ends of said conneotion, lugs depending from the center of said yoke, and connecting means for a cable fastened to said lugs so that strain from said cable in normal position passes through the center of the zone in which the stress of said yoke is borne by said mast so that the reaction from the vertical stress is distributed equally over the entire area of said zone.

WILLIAM E. HALE. 

